201390881 has 4 divisors (see below), whose sum is σ = 201422100. Its totient is φ = 201359664.

The previous prime is 201390841. The next prime is 201390919. The reversal of 201390881 is 188093102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23435281 + 177955600 = 4841^2 + 13340^2 .

It is a cyclic number.

It is not a de Polignac number, because 201390881 - 2²⁶ = 134282017 is a prime.

It is a super-2 number, since 2×201390881² = 81116573899912322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201390821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946 + ... + 20163.

It is an arithmetic number, because the mean of its divisors is an integer number (50355525).

Almost surely, 2^201390881 is an apocalyptic number.

It is an amenable number.

201390881 is a deficient number, since it is larger than the sum of its proper divisors (31219).

201390881 is an equidigital number, since it uses as much as digits as its factorization.

201390881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31218.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 201390881 is about 14191.2254932405. The cubic root of 201390881 is about 586.1560707121.

The spelling of 201390881 in words is "two hundred one million, three hundred ninety thousand, eight hundred eighty-one".